#include <stdio.h>
struct X {char a[8];};
struct X salutation(void){
    struct X result={"Hello"};
    return result;
}
struct X addressee(void){
    struct X result={"world"};
    return result;
}
int main(void){
    struct X my_salutation=salutation();
    struct X my_addressee=addressee();
    printf("%s,%s!\n",my_salutation.a,my_addressee.a);
    return 0;
}